Re: FourierTransform of Sign^2 ?

*To*: mathgroup at smc.vnet.net*Subject*: [mg80045] Re: [mg79997] FourierTransform of Sign^2 ?*From*: "Jung-Tsung Shen" <jushen at gmail.com>*Date*: Sat, 11 Aug 2007 02:11:10 -0400 (EDT)*References*: <200708100552.BAA10934@smc.vnet.net>

Thanks for checking this. I found a version of 5.1 and it gives the correct answer. I guess it's a bug in v. 5.0 then. JT On 8/10/07, Sseziwa Mukasa <mukasa at jeol.com> wrote: > > On Aug 10, 2007, at 1:52 AM, Jung-Tsung Shen wrote: > > > I tried to evaluate the following Fourier Transform: > > > > FourierTransform[Sign[y] Sign[y], y, q] > > > > where Sign is the sign function. Instead of Sqrt[2 Pi]*DiracDelta[q], > > Mathematica (v. 5.0, Mac) gives > > > > -Sqrt[2 Pi]*DiracDelta[q] > > > > with a minus sign. Is this a bug or I am doing something wrong here? > > v5.2 on a Mac gives > > In[1]:= > FourierTransform[Sign[y] Sign[y], y, q] > Out[1]= > Sqrt[2 Pi] DiracDelta[q] > > Regards, > > Ssezi >

**References**:**FourierTransform of Sign^2 ?***From:*"Jung-Tsung Shen" <jushen@gmail.com>